Door check structure



NOV- 7, wHlTE DOOR CHECK STRUCTURE Filed Feb. 18, 1931 lA VlA/M/VV INVENTOR. Arthur White WWW ATTORNEYS.

"lOl

Patented Nov. 7, 1933 'UNl'lED STATES PATENT OFFICE Application February 18, 1931 Serial No. 516,695 7 1 Claim. (01. 16-84) My invention relates to door checks and has particular reference to that type wherein a relatively viscous fluid serves as a yielding resistance to check the force of a door as it swings to closed position.

This broad type of door check is old in the art but hitherto all available types have had the distinct disadvantage of being so Constructed that leakage of the fluid to the exterior of the mechanism was unavoidable.

A primary obiectof my invention is to so arrange the parts utilized that the possibility of leakage to the exterior of the mechanism is substantially eliminated, at the same time providing the simplest sort of mechanism with a minimum number of moving parts so constructed that they are inexpensive to manufacture and simple to assemble.

Another object of my invention is to provide a compact, sturdy mechanism of small dimensions having a relatively small cross sectional dimension to permit its insertion in a door frame or joint.

Still another object of my invention is to secure a smooth and substantially uniform movement of the door as it swings to closed position after meeting the resistance offered by the check. In the carrying out of this object I contemplate utilizing an improved bumper plate which is provided with an angular portion adapted to lie in a plane substantially normal to the plunger of the door check on initial closing movement of the door. In this way the tendency to displace the bumper plate from its position by continual ap- 5 plication of pressure at an angle thereagainst will be eliminated. This angular portion is also adapted to produce a smoother re-actance of the door check plunger upon its initial contact with the bumper plate, eliminating all binding thereof and permitting the resisting action to closing movement of the door to take place in two distinctly graduated and successive steps.

A further object of my invention resides in the particular arrangement and combination of parts 45; to produce the compact assembly which will be more clearly shown and described hereinafter in conjunction with the accompanying drawing wherein:

Fig. 1 is a sectional elevation,

2 is a section along 2-2 of Fig. 1, and

Fi 3 is a section illustrating the improved bumper plate utilized in conjunction with my novel door check.

My improved door check assembly is broadly indicated by the numeral 10 and is adapted to be set within either the door frame 12 or the door jamb 14. The bumper plate 16 will, of course, be set in the other of the two elements, being here illustrated in 3 as set in the cut away portion of the jamb and secured thereto by means of wood screws 18.

The door checkassembly comprises an integral casing 20 which is preferably a steel casting. The casing is provided at its forward end with vertically extendingflanges 22 and 24, each of which is provided with countersunk apertures 26 and 28 through which wood screws may be inserted to position the assembly in a socket formed in the door frame. (See Fig. 3'.)

The upper forward portion of the casting is provided with a cored out bearing 30 in which the plunger 32 is adapted to slide. The inner extremity of plunger 32 is providedwith a flange 34 which is adapted to seat upon a shoulder 36 of the bearing 30, thus limiting the outward movement of plunger 32.

The lower forward portion of the casting is provided with a cylinder 38 in which piston 40 is adapted to slide. This piston is provided at its forward extremity with a shoulder 42 upon '0; which the coil spring 44 is adapted to seat, the opposite end of the coil spring seating against the closed extremity of cylinder 38. It will be noted that the cored bearing 30 and cylinder 38 extend along but a portion of the length of 5' the casing, the casing being substantially free and clear of all operating mechanism rearwardly thereof.

The piston 40 is provided with an opening 46 at its forward end, which opening is connected by means of a central passageway 48 with a vertical passageway 50 extending through a restricted rear end portion 52 of the piston. The forward extremity of opening 46 houses ball check valve 53 which is retained therein by an apertured closure member 54 which seats in an annular shoulder about the opening.

A pivot pin 56 is soldered between the side walls 58 and 60 of the casing 20 and pivoted thereon intermediate its extremity is a double ended lever 62. The forward extremity of this lever comprises a round cam shaped nub 64 adapted to slide with little resistance across the flanged head 34 of plunger 32 as the latter moves inwardly and outwardly and. the lower forward extremity of the lever is provided with a similar rounded nub 66 which is adapted to function in a similar fashion across the restricted end 52 of piston 40.

The upper wall 68 of cylinder 38 is provided with a longitudinally extending passageway '70 which is connected by means of a vertical passageway '72 with the cylinder itself. A needle valve 74 is adapted to control the flow of fluid from the cylinder through the passageway 70 back into the chamber formed by the casing. The screw 76 permits refilling of the casing 20 with fluid from time. to time, the level of the fluid preferably being maintained at substantially that of the refilling opening.

My improved bumper plate which operates in conjunction with the plunger 32 of the door check comprises a plate 16 which is set in the door jamb 14 and is provided with the angular portion 78 against which the plunger 32 will first contact on closing movement of the door. In this way two successive resistances, each substantially normal to the direction of travel of the door check plunger, will be provided and a smooth 'fiowing closing movement of the door will result.

It will be apparent from the foregoing that plunger 32, upon contacting the bumper plate 16 as the door closes, will be forced inwardly thereby forcing the piston 40 outwardly through the lever 62. The ball check will remain seated as the piston moves forwardly to force the fluid through the passageways '72 and '70 back into the main chamber. When the door is again opened the spring 44 will force the piston 40 back into the position illustrated in full lines in Fig. 1, the fluid passing through passageways 50 and 48 through the open ball check valve into the cylinder 38 during this movement.

Due to the fact that the plunger. 32 does not come in contact with any of the fluid there is no possibility of developing leakage to the exterior of the door check and there is no necessity for utilizing packing glands, washers, etc., in an attempt to prevent such leakage. The closure member 80 for the rear of the casing 20 is soldered to the said casing and the pivot pin 56 is likewise soldered to the side walls, thereby substantially eliminating any possibility of leakage through the exterior of the casing.

Having illustrated a preferred form of my invention, various modifications will be apparent to those skilled in the art and for that reason I intend to limit myself only within the scope of the appended claim.

What I claim:

A door check comprising a casing of relatively narrow cross section adapted for insertion in a door jamb, pistons longitudinally slidable along the upper and lower portion of said casing, the upper piston being adapted to project through a wall of the casing, a double ended lever pivoted intermediate its ends and having cam shaped extremities adapted to engage the inner extremities of said pistons, and means associated with one of said pistons for yieldingly resisting its movement in one direction.

' ARTHUR WHITE. 

